Paper-pulp-digester sliding valve



Modef T. ATGHESQN.

PAPER PULP DIGESTBR'SLIDING VALVE. No2-59,658.' Y Patented June 20, 1882.4

y UNITE raras Amrum Fries.

THEOPHILUS ATGHESON, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO IIIMSELF AND JOHN SAUNDERS, OF WILMINGTON, DELAIVARE.

PAPER-PULP-DIGESTER SLIDING VALVE.

SPECIFICATION forming part of Letters Patent No. 259,658, dated June 20, 1882.

Application filed March 23, 1832. (No model.)

To all whom it may concern:

Be it known that I, THEOPHILUS ATCHE- SON, of Philadelphia, Pennsylvania, have invented certain new and useful Improvements in Iaper-Pulp-Digester Sliding Valves; and I do hereby declare the following to be a full, clear, and exact description ot' the same, reference being had to the annexed drawings, making part hereof.

'lhe nature of my invention will be fully apparent from the following specilication and claims.

In the drawings, Figure l is a longitudinal vertical sectional view of myinventionon the line V W of Fig. 2; Fig. 2, a vertical crossseclional view on theline X Y of Fig. l. Fig. 3 is a perspective view of the box and the adjustable guide and wedge in position; Fig. 4, a detached view of the combined adjustable zo guide and wedge; Fig. 5, a detached perspective view of the sliding valve.

My invention relates to the class of valves used to discharge the contents ot' paper-pulp digesters, though the device may be used for many other purposes-for instance, discharging the contents of crude-petroleum tanks and other liquids and masses of suspended matter in liquids.

A is the valve chest or box, so constructed as to have two opposite slots, B B, at each end, which in my apparatus I accomplish bythe projections U, which extend transversely partially across the inner space of the box A, as shown in Fig. 3.

D is the guide for the sliding valve, the edges G G ofthe valve overlapping and sliding upon the guides, one of which guides D is placed in each side of the inner space of the chest A.

4o E is the wedge or incline, set upon the inside of each of the guides and forming integral parts thereof, though lettered separately.

F is the sliding valve, provided with overlapping ed ges G G and downwardly-proj ect-ing 4 5 pieces F F', backwardly inclined at their front edges, after the manner of Sledge-runners, to correspond with the angle of the inclines of wedges E, and adapted to run up thereon in such manner as to keep the upper face of the 5o valve F in a true horizontal plane. `The overlapping edges G G of the face of the valve F,

Fig. 5, bear upon the upper edges of guides D D. (See Fig. 2.)

II forms the top ofthe valve-chest, and ils lower surface, H', (which is shown projecting 55 down into the inner space ofthe chesh) forms the seat for the sliding valve F.

I I are the valve-openings through the top H and bottom J, respectively, of the valvechest. rIlie sliding valve F is furnished be- 6o tween and at the back of thepieces F F with a double back, the more forward one, K, being full, so as to back completely the space between pieces F F and from thelo wer surface ofthe top face of valve- F to the upper surface of the bottom of the chest, while the true back L of the valve is slotted from a point a little above its middle to its lower edge to receive the adj usting-rod M to open and close it. The rod M is plain and round from its connection 7o with the valve F to a point so far outside ofI the hack N of the chest A as to allow for the length of its plain surface for the free movement of valve F for the length of the forward and backward movement ofthe valve, and the rod passes through the back N of the chest A through a stuffing-box, O. Therod is screwthreaded at P, nearits extremity, for a length equal to or slightly longer than the required movement of the valve, and this screw-threaded 8o portion engages with and passes through a correspondingly fem ale-screW-threaded box or bearin g, R, which box or bearin g is sustained by an arm, S, or other suitable device. A hand-wheel, T, serves to turn the rod M and move it and the valve F backward and forward.

U is a flange, by which the valve-chest is secured to the flan ge of the discharge-openin g in the bottom ofthe pulp-digester or other vessel, 9o the contents of which are to be discharged.

I have shown two collars or rings, Z Z', on the inner end of rod, M, to bear against each back of the valve in throwing it forward; but the ring Z may be dispensed with, as it only operates in closing and not in opening the valve.

All the parts of my valve are constructed of cast-iron excepting the rod M, which I make of wrought-iron and turn the thread upon it. roo

The guides D D, as they become worn by the friction of the siidiu g valve upon them, can be set up77 by merely setting beneath each ot' them a strip ot' sheet metal equal in thickness to the depth of wear and extending beneath each guide in its whole length from slot B to opposite slot B.

The operation is as follows: The flange U', as mentioned above, is attached to the flange of the dischargeorice of the pulp-digester, the interior of which digester is under great steam-pressure. By turning the rod M the valve F is drawn back from the opening I and the contents ot' the digester rush out through the openings I l. At'ter this the valve is closed by reversing the motion employed in turning rod M. The valve Fis pushed forward, and as it moves it mounts upon the inclines of wedges E E by means of its correspondinglyslanted pieces F' F', and the upper full face of the upper surface ot' thev valve F is thrown into close Contact with the lower surface or seat, H', of the cover H oi' the valve-chest, as shown in Fig. l, thus e'ectually closing the exit from the digester. rlhe cover H projects downward slightly into the space within the valve-chest A, which is done simply to add thickness to the cover, to provide for the wear occasioned by planing, grinding, or truing" the seat from time to time, and to give opportunity for giving it a uniform surface in so truing it by planing the said projection only. By means of the false back K to the valve F the pulp or matter in suspension in the contents ofthe digester or vessel being discharged is prevented from passing through to the back ot' the valve, as the back K fills all the space across, and the said contents are thus forced to seek their only exit through the lower opening, I. lhus I avoid the danger ofgetting alot of solid matter back ot' the valve F and between it and the back N of the chest A, which might prevent the full opening of the valve eventually.

In applying my valve to oil and other tanks where there is no danger of solid matter cloging the valve, the false back K may be dis pensed with.

That I claim as new isl. In a valve for paper-pulp digesters, the combination of chest A H, seat H', sliding valve F, with its inclined pieces F' F', full back K to the sliding valve, wedges E E for throwing the upper surface of the valve F truly against the seat H', and a stem or rod, M, for opening and closing the valve, substantially as described.

2. In a valve for paper-pulp digesters, the combination of chest A H, seat H', sliding valve F, with its inclined pieces F' F', full back K to the sliding valve, detachable adjustable guides D D, Wedges E E, for the purpose described, and a stem or rod, M, to open and close the valve, substantially as described.

3. In a sliding valve for discharging the contents of vessels after the treatment of said contents, tlie combination of chest A H, seat- H', sliding valve F, with its inclined pieces F' F', Wedges E E for throwing the valve and its seat into contact, and stem M to open and close the valve, substantially as described.

4. In a sliding valve for discharging the contents of vessels after the treatment of said contents, the combination ot' chest A H, seat H', sliding valve F, with its inclined pieces F' F', Wedges E E for throwing the valve and its seat into contact, adjustable removable guides D D, and stein M to open and close the valve, substantially as described.

THEOPHILUS ATCHESON.

Vitnesses:

GEORGE E. BUcKLEY, WM. H. CARSON. 

